linux-kernel - Re: [PATCH 2/6] extcon-gpio: If the gpio driver/chip supports debounce, use it

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Date:	Wed, 11 Sep 2013 10:16:38 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ian.campbell@...rix.com>,
	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Grant Likely <grant.likely@...aro.org>
Subject: Re: [PATCH 2/6] extcon-gpio: If the gpio driver/chip supports
 debounce, use it

Hi Guenter

I agree to use gpio_set_debounce() API but, I suggest following patch to code clean.
and I'd like you to use declarative sentence on patch name instead of 'If ...'.

On 08/30/2013 01:29 PM, Guenter Roeck wrote:
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---
>  drivers/extcon/extcon-gpio.c |    5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/extcon/extcon-gpio.c b/drivers/extcon/extcon-gpio.c
> index 77d35a7..973600e 100644
> --- a/drivers/extcon/extcon-gpio.c
> +++ b/drivers/extcon/extcon-gpio.c
> @@ -111,6 +111,11 @@ static int gpio_extcon_probe(struct platform_device *pdev)
>  	if (ret < 0)
>  		goto err;
>  
> +	/* Use gpio debounce if available. If so, don't debounce in software. */
> +	if (pdata->debounce &&
> +	    !gpio_set_debounce(extcon_data->gpio, pdata->debounce * 1000))
> +		extcon_data->debounce_jiffies = 0;
> +
>  	INIT_DELAYED_WORK(&extcon_data->work, gpio_extcon_work);
>  
>  	extcon_data->irq = gpio_to_irq(extcon_data->gpio);
> 

diff --git a/drivers/extcon/extcon-gpio.c b/drivers/extcon/extcon-gpio.c
index 3943ce2..0777e72 100644
--- a/drivers/extcon/extcon-gpio.c
+++ b/drivers/extcon/extcon-gpio.c
@@ -56,8 +56,10 @@ static irqreturn_t gpio_irq_handler(int irq, void *dev_id)
 {
        struct gpio_extcon_data *extcon_data = dev_id;
 
-       queue_delayed_work(system_power_efficient_wq, &extcon_data->work,
-                             extcon_data->debounce_jiffies);
+       if (extcon_data->debounce_jiffies)
+               queue_delayed_work(system_power_efficient_wq,
+                                  &extcon_data->work,
+                                  extcon_data->debounce_jiffies);
        return IRQ_HANDLED;
 }
 
@@ -100,7 +102,14 @@ static int gpio_extcon_probe(struct platform_device *pdev)
        extcon_data->state_off = pdata->state_off;
        if (pdata->state_on && pdata->state_off)
                extcon_data->edev.print_state = extcon_gpio_print_state;
-       extcon_data->debounce_jiffies = msecs_to_jiffies(pdata->debounce);
+       extcon_data->debounce_jiffies = 0;
+       if (pdata->debounce) {
+               ret = gpio_set_debounce(extcon_data->gpio,
+                                       pdata->debounce * 1000);
+               if (ret < 0)
+                       extcon_data->debounce_jiffies =
+                               msecs_to_jiffies(pdata->debounce);
+       }
 
        ret = extcon_dev_register(&extcon_data->edev, &pdev->dev);
        if (ret < 0)
@@ -111,11 +120,6 @@ static int gpio_extcon_probe(struct platform_device *pdev)
        if (ret < 0)
                goto err;
 
-       /* Use gpio debounce if available. If so, don't debounce in software. */
-       if (pdata->debounce &&
-           !gpio_set_debounce(extcon_data->gpio, pdata->debounce * 1000))
-               extcon_data->debounce_jiffies = 0;
-
        INIT_DELAYED_WORK(&extcon_data->work, gpio_extcon_work);
 
        extcon_data->irq = gpio_to_irq(extcon_data->gpio);
@@ -146,7 +150,8 @@ static int gpio_extcon_remove(struct platform_device *pdev)
 {
        struct gpio_extcon_data *extcon_data = platform_get_drvdata(pdev);
 
-       cancel_delayed_work_sync(&extcon_data->work);
+       if (extcon_data->debounce_jiffies)
+               cancel_delayed_work_sync(&extcon_data->work);
        free_irq(extcon_data->irq, extcon_data);
        extcon_dev_unregister(&extcon_data->edev);


Thanks,
Chanwoo Choi
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